rust/tests/run-make/wasm-symbols-not-imported/foo.rs

#![crate_type = "cdylib"]
#![no_std]

use core::panic::PanicInfo;

#[no_mangle]
pub extern fn foo() {
    panic!()
}

#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    loop {}
}